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2 Centauri

Summary

2 Centauri is a single[13] star in the southern constellation of Centaurus, located approximately 183 light-years from Earth.[3] It has the Bayer designation g Centauri;[12] 2 Centauri is the Flamsteed designation. This object is visible to the naked eye as faint, red-hued star with an apparent visual magnitude of 4.19.[4] It is moving away from the Earth with a heliocentric radial velocity of +41 km/s.[8] The star is a member of the HR 1614 supercluster.[14]

2 Centauri

A light curve for V806 Centauri. The main plot shows the long term variability from Hipparcos data,[1] and the inset plot shows the variability over the 26.5 day period, using data from Tabur et al. (2009).[2] The green curve shows the best-fit sine wave, which has an amplitude of 18 millimagnitudes.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 49m 26.72175s[3]
Declination −34° 27′ 02.7929″[3]
Apparent magnitude (V) 4.19[4] (4.16–4.26)[5]
Characteristics
Spectral type M5 III[6]
U−B color index +1.44[7]
B−V color index +1.49[7]
Variable type SRb[5]
Astrometry
Radial velocity (Rv)+40.7±0.7[8] km/s
Proper motion (μ) RA: −41.68±0.23[3] mas/yr
Dec.: −59.77±0.18[3] mas/yr
Parallax (π)17.82 ± 0.21 mas[3]
Distance183 ± 2 ly
(56.1 ± 0.7 pc)
Absolute magnitude (MV)+0.51[9]
Details
Radius70[10] R☉
Luminosity71.96[4] L☉
Temperature3,398[11] K
Other designations
g Centauri, 2 Cen, V806 Cen, CD−33°9358, GC 18666, HD 120323, HIP 67457, HR 5192, SAO 204875[12]
Database references
SIMBADdata

This is an evolved red giant star with a stellar classification of M5 III.[6] It is classified as a semiregular variable star and its brightness varies from magnitude +4.16 to +4.26[5] with a period of 12.57 days.[15] The star has around 70[10] times the Sun's radius and is radiating 72[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,398 K.[11]

References edit

  1. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^ Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–1961. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.
  3. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  4. ^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  7. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  8. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  9. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID 12136256.
  10. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics. 367 (Third ed.): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  11. ^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
  12. ^ a b "2 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-06.
  13. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  14. ^ Eggen, Olin J. (June 1998). "The HR 1614 Group and HIPPARCOS Astrometry". The Astronomical Journal. 115 (6): 2453–2458. Bibcode:1998AJ....115.2453E. doi:10.1086/300380.
  15. ^ Ruban, E. V.; Arkharov, A. A.; Hagen-Thorn, E. I.; Novikov, V. V. (September 2009). "Physical parameters of the semiregular variable red giant 2 Cen". Astrophysics. 52 (3): 383–394. Bibcode:2009Ap.....52..383R. doi:10.1007/s10511-009-9075-3. S2CID 121256121.

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